Device for pressing pouch-type secondary battery and method for pressing pouch-type secondary battery using same

Abstract

The present invention relates to a device for pressing a pouch-type secondary battery and a method for pressing a pouch-type secondary battery using same, the device being characterized by comprising: a pressing plate provided to press a pouch-type secondary battery; a support plate positioned in front of the pressing plate; and a driving unit for driving the pressing plate forward and backward, wherein the pressing plate comprises a first pressing plate for pressing a central portion of the pouch-type secondary battery, and second pressing plates disposed on both sides of the first pressing plate to press the edges of the pouch-type secondary battery.

Description

Pouch-type secondary battery pressurizing device and pouch-type secondary battery pressurizing method using the same

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0190566 filed December 18, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0002] The present invention relates to a pouch-type secondary battery pressurizing device and a pouch-type secondary battery pressurizing method using the same, and more specifically, to a pouch-type secondary battery pressurizing device capable of uniformly pressurizing a pouch-type secondary battery throughout and a pouch-type secondary battery pressurizing method using the same.

[0003]

[0004] With the increasing technological development and demand for mobile devices, rechargeable secondary batteries are being used as an energy source for various mobile devices. Secondary batteries are also attracting attention as an energy source for electric vehicles and hybrid electric vehicles, which are being presented as alternatives to conventional gasoline and diesel vehicles that use fossil fuels.

[0005] Secondary batteries are classified according to the shape of the battery case into cylindrical and prismatic batteries, in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is embedded in a pouch-type case made of aluminum laminate sheets.

[0006] A typical manufacturing process for pouch-type secondary batteries involves inserting an electrode assembly into a battery case housing made of laminate sheets, injecting an electrolyte into the battery case, sealing it, and performing an activation process; in this activation process, a formation jig is used to pressurize the battery cell.

[0007] FIG. 1 is a conceptual diagram showing a part of a pouch-type secondary battery pressurizing device according to the prior art, and FIG. 2 is a plan view for explaining a pouch-type secondary battery.

[0008] As illustrated in FIGS. 1 and 2, by pressing a pouch-type secondary battery (10) placed between a plurality of pressure plates (1) with a pressure plate (1), the activation process of the pouch-type secondary battery (10) can be carried out.

[0009] However, since the pressure is applied mainly to the center of the pressure plate (1), as the length of the pouch-type secondary battery (10) increases, the pressure becomes weaker towards both sides in the direction of the length of the pressure plate (1), resulting in uneven pressure, which can eventually lead to defects in the secondary battery.

[0010]

[0011] (Prior Art Literature)

[0012] (Patent Document 1) Korean Published Patent Application No. 10-2024-0044781

[0013]

[0014] In order to solve the above-mentioned problems, the present invention aims to provide a pouch-type secondary battery pressurizing device capable of uniformly applying pressure to the central part and the edge of a pouch-type secondary battery, and a pouch-type secondary battery pressurizing method using the same.

[0015]

[0016] As a technical means for achieving the above-mentioned purpose, a pouch-type secondary battery pressurizing device according to one embodiment of the present invention comprises: a pressurizing plate (100) provided to pressurize a pouch-type secondary battery (10); a support plate (200) located in front of the pressurizing plate (100); and a driving unit (300) for driving the pressurizing plate (100) back and forth, wherein the pressurizing plate (100) comprises a first pressurizing plate (110) that pressurizes the central part of the pouch-type secondary battery (10), and a second pressurizing plate (120) disposed on both sides of the first pressurizing plate (110) that pressurizes the edges of the pouch-type secondary battery (10).

[0017] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the driving unit (300) is characterized by including: a first driving unit (310) for driving the first pressurizing plate (110); and a second driving unit (320) for driving the second pressurizing plate (120).

[0018] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the second pressurizing plate (120) is characterized by including a seconda pressurizing plate (121) located on one side of the first pressurizing plate (110) and a secondb pressurizing plate (122) located on the other side of the first pressurizing plate (110).

[0019] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the first pressurizing plate (110) is formed with a first recessed portion (111) with one side partially recessed and a second recessed portion (112) with the other side partially recessed, the seconda pressurizing plate (121) is formed with a first protrusion (121a) that partially protrudes to be coupled with the first recessed portion (111), and the secondb pressurizing plate (122) is formed with a second protrusion (122a) that partially protrudes to be coupled with the second recessed portion (112).

[0020] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the first pressurizing plate (110) is characterized in that the connection with the second pressurizing plate (120) is maintained during forward driving, but the connection with the second pressurizing plate (120) is released during reverse driving.

[0021] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the second pressurizing plate (120) is characterized in that the connection with the first pressurizing plate (110) is released when driving forward, but the connection with the first pressurizing plate (110) is maintained when driving backward.

[0022] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the first driving unit (310) is characterized by being equipped with a motor.

[0023] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the second driving unit (320) is characterized by being provided as a cylinder.

[0024] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the pressurizing plates (100) are provided in a plurality and are arranged side by side at a predetermined distance apart in the forward and backward directions.

[0025] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the support plate (200) is characterized by being positioned at a predetermined distance from the pressurizing plate (100) located at the very front of the plurality of pressurizing plates (100).

[0026] In addition, in a pouch-type secondary battery pressurizing device according to one embodiment of the present invention, the support plate (200) is provided to support and press the front surface of the pouch-type secondary battery (10) located furthest forward when the pressurizing plate (100) presses a plurality of pouch-type secondary batteries (10).

[0027] In addition, the pouch-type secondary battery pressurizing device according to one embodiment of the present invention is characterized by further including a guide member (400) that penetrates the plurality of pressurizing plates (100) to guide the forward and backward movement of the plurality of pressurizing plates (100) and has one end connected to the support plate (200).

[0028] In addition, a method for pressurizing a pouch-type secondary battery using a pouch-type secondary battery pressurizing device according to one embodiment of the present invention comprises: (S1) a step of positioning the pouch-type secondary battery (10) between a pair of pressurizing plates (100) or between a pressurizing plate (100) and a support plate (200); (S2) a step of driving the pressurizing plate (100) forward through the driving unit (300); (S3) a step of pressurizing the pouch-type secondary battery (10) through the pressurizing plate (100); and (S4) a step of pressurizing both edge portions of the pouch-type secondary battery (10) through the second pressurizing plate (120).

[0029]

[0030] As explained above, according to the pouch-type secondary battery pressurizing device and the pouch-type secondary battery pressurizing method using the same according to the present invention, the pressurizing plate is configured to be separated into a first pressurizing plate that presses the central part of the pouch-type secondary battery and a second pressurizing plate that presses the edge of the pouch-type secondary battery, thereby having the advantage of being able to pressurize the entire surface area of ​​the pouch-type secondary battery with uniform pressure.

[0031]

[0032] FIG. 1 is a conceptual diagram showing a part of a pouch-type secondary battery pressurizing device according to the prior art.

[0033] Figure 2 is a plan view illustrating a pouch-type secondary battery.

[0034] FIG. 3 is a perspective view of a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention.

[0035] FIG. 4 is a plan view for explaining a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention.

[0036] FIG. 5 is a plan view for explaining a pressure plate constituting a pouch-type secondary battery pressure device according to a first embodiment of the present invention.

[0037] FIG. 6 is a perspective view illustrating the position of a pouch-type secondary battery on a pressure plate of a pouch-type secondary battery pressure device according to a first embodiment of the present invention.

[0038] FIG. 7 is a conceptual diagram illustrating a method of operating a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention.

[0039] FIG. 8 is a plan view illustrating a modified pressure plate constituting a pouch-type secondary battery pressure device according to a first embodiment of the present invention.

[0040] FIG. 9 is a perspective view of a pouch-type secondary battery pressurizing device according to a second embodiment of the present invention.

[0041] FIG. 10 is a side view illustrating a pouch-type secondary battery pressurizing device according to a second embodiment of the present invention.

[0042] FIG. 11 is a perspective view for explaining a pressure plate constituting a pouch-type secondary battery pressure device according to a second embodiment of the present invention.

[0043] FIG. 12 is a perspective view illustrating the position of a pouch-type secondary battery on a pressure plate of a pouch-type secondary battery pressure device according to a second embodiment of the present invention.

[0044] FIG. 13 is a conceptual diagram illustrating a method for operating a pouch-type secondary battery pressurizing device according to a second embodiment of the present invention.

[0045]

[0046] Embodiments that enable a person skilled in the art to easily implement the present invention are described in detail below with reference to the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description is omitted.

[0047] In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected, but also cases where they are indirectly connected with other elements in between. Furthermore, unless specifically stated otherwise, the inclusion of a certain component does not exclude other components but implies that additional components may be included.

[0048]

[0049] Hereinafter, a pouch-type secondary battery pressurizing device according to the present invention and a pouch-type secondary battery pressurizing method using the same will be described.

[0050] First, referring to FIG. 2, the pouch-type secondary battery (10) may be a pouch-type secondary battery comprising a battery case (11) that accommodates an electrode assembly (not shown) equipped with a pair of electrode leads (12), and a sealing portion at the edge of the battery case (11). At this time, the battery case (11) may be composed of a first pocket portion (not shown) that accommodates the electrode assembly and a second pocket portion (not shown) for gas collection. The pair of electrode leads (12) may be provided as a positive electrode lead and a negative electrode lead.

[0051] Meanwhile, the battery case (11) is manufactured using a laminate sheet consisting of an outer coating layer, a metal layer, and an inner coating layer.

[0052] Since the inner coating layer comes into direct contact with the electrode assembly, it must possess insulation and electrostatic resistance. Additionally, to ensure sealing from the outside, the sealing area formed by the thermal bonding of the inner layers must have excellent thermal bonding strength.

[0053] The material for this inner coating layer may be selected from, but is not limited to, polyolefin resins such as polypropylene, polyethylene, polyethyleneacrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties; however, polypropylene is most preferable due to its excellent mechanical properties such as tensile strength, stiffness, surface hardness, and impact strength, as well as its chemical resistance.

[0054] The metal layer in contact with the inner coating layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a lightweight aluminum film with excellent formability can be used as a preferred material for this metal layer.

[0055] In addition, an outer coating layer is provided on the other side of the metal layer, and this outer coating layer may use a heat-resistant polymer with excellent tensile strength, moisture resistance, and air permeability resistance to ensure heat resistance and chemical resistance while protecting the electrode assembly, and may use, for example, nylon or polyethylene terephthalate, but is not limited thereto.

[0056] Meanwhile, the electrode assembly housed in the battery case (11) may be a jelly-roll type electrode assembly in which a separator is interposed between a long sheet-type negative electrode and a positive electrode and then wound, or a stack type electrode assembly in which unit cells are stacked with a rectangular positive electrode and a negative electrode interposed between them, a stack-folding type electrode assembly in which unit cells are wound by a long separating film, or a lamination-stack type electrode assembly in which unit cells are stacked with a separator interposed between them and attached to each other, but is not limited thereto.

[0057] The positive electrode is composed of a positive current collector and a positive active material coated on the upper and lower surfaces of the positive current collector; the positive active material may be mixed with a conductive material and a binder, and a filler may be further added if necessary.

[0058] The cathode is composed of a cathode current collector and a cathode active material applied to the lower and upper surfaces of the cathode current collector, and a conductive material and a binder may be additionally mixed into the cathode active material and coated onto the cathode current collector.

[0059] The separator prevents a short circuit between the aforementioned cathode and anode and enables only the movement of lithium ions. The material of such a separator is preferably selected from polyethylene, polypropylene, a polyethylene / polypropylene double layer, a polyethylene / polypropylene / polyethylene triple layer, a polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0060]

[0061] FIG. 3 is a perspective view of a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention, and FIG. 4 is a plan view for explaining a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention. FIG. 5 is a plan view for explaining a pressurizing plate constituting a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention, FIG. 6 is a perspective view for explaining a pouch-type secondary battery positioned on a pressurizing plate of a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention, and FIG. 7 is a conceptual diagram for explaining a method of operating a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention.

[0062] Referring to FIGS. 2 to 7, a pouch-type secondary battery pressurizing device according to the first embodiment of the present invention comprises a pressurizing plate (100), a support plate (200), a driving unit (300), and a guide member (400).

[0063] A plurality of pressure plates (100) may be provided to pressure the pouch-type secondary battery (10), and may be provided to have an area equal to or larger than that of the pouch-type secondary battery (10) so as to be able to pressure the entire surface of the pouch-type secondary battery (10).

[0064] At this time, the pouch-type secondary battery (10) that is pressurized by the pressure plate (100) may be a bidirectional pouch-type secondary battery (10) in which a pair of electrode leads (12) are positioned facing each other.

[0065] The pressure plates (100) can be arranged in parallel at a predetermined distance apart in the forward and backward direction (z-axis direction in FIG. 3) so as to be placed on one or more of the front and rear surfaces of the pouch-type secondary battery (10). A driving unit (300) can be connected to the pressure plate (100) located furthest rear (8 o'clock direction in FIG. 3) among the plurality of pressure plates (100).

[0066] The pressure plate (100) may be provided to include a first pressure plate (110) that presses the central part of the pouch-type secondary battery (10) and a second pressure plate (120) that presses the edge of the pouch-type secondary battery (10). Here, the central part of the pouch-type secondary battery (10) refers to the central part based on the electric direction of the pouch-type secondary battery (10), and the edge of the pouch-type secondary battery (10) may be the two edges on which a pair of electrode leads (12) protrude.

[0067] The pressure plate (100) is divided into a first pressure plate (110) and a second pressure plate (120), so that when the pouch-type secondary battery (10) is pressured, the second pressure plate (120) provides additional pressure, thereby providing pressure to correspond to the pressure required by the edge portion of the pouch-type secondary battery (10). This allows for more stable and accurate transmission to correspond to the pressure required by the center portion and the edge portion compared to when a single pressure plate is provided to provide pressure to the center portion and the edge portion of the pouch-type secondary battery (10) through multiple driving units.

[0068] It is preferable that the total length (in the x-axis direction, based on FIG. 6) of the first pressure plate (110) is less than the total length of the pouch-type secondary battery (10). At this time, the total length of the pouch-type secondary battery (10) is the x-axis direction in which a pair of electrode leads (12) protrude, and the total width is the y-axis direction in which a pair of electrode leads (12) do not protrude.

[0069] Additionally, partially sunken portions (111, 112) may be formed at both ends of the first pressure plate (110). More specifically, a first sunken portion (111) may be formed at one end (12 o'clock direction in Fig. 5) of the first pressure plate (110) with a partially sunken portion, and a second sunken portion (112) may be formed at the other end (6 o'clock direction in Fig. 5) with a partially sunken portion.

[0070] The first recess (111) and the second recess (112) of the first pressure plate (110) can be formed for interlocking connection with the second pressure plate (120).

[0071] The second pressure plate (120) may include a seconda pressure plate (121) and a secondb pressure plate (122) positioned on both sides of the first pressure plate (110) to apply pressure to the edges of the pouch-type secondary battery (10).

[0072] The overall length (in the x-axis direction based on FIG. 6) of the second pressure plate (120) may be provided to have a length equal to or greater than the edge of the pouch-type secondary battery (10) from one end or the other end of the first pressure plate (110).

[0073] A second pressure plate (121) may be positioned on one side of the first pressure plate (110) (at the 12 o'clock direction in Fig. 5) to apply pressure to one edge of the pouch-type secondary battery (10), and a second pressure plate (122) may be positioned on the other side of the first pressure plate (110) (at the 6 o'clock direction in Fig. 5) to apply pressure to the other edge of the pouch-type secondary battery (10).

[0074] In this second pressure plate (121), a first protrusion (121a) may be formed that partially protrudes toward the other side (6 o'clock direction in Fig. 5) to be coupled with the first recess (111) of the first pressure plate (110). At this time, the first protrusion (121a) may be formed with a protruding end corresponding to the position where the first recess (111) is formed for interlocking coupling with the first recess (111), and may be formed in a shape corresponding to the first recess (111).

[0075] For example, when the first recess (111) is formed by one side of the front portion of the first pressure plate (110) being recessed inward, the first protrusion (121a) may be formed by the other side of the front portion of the second pressure plate (121) being protruded outward, and accordingly, the first protrusion (121a) and the first recess (111) may be interlocked. At this time, the first recess (111) and the first protrusion (121a) may be formed in a stepped shape with a step difference, but are not limited thereto.

[0076] The first recess (111) of the first pressure plate (110) has a front end that is partially recessed to form a step at the rear end, and the first protrusion (121a) has a front end that is partially protruded to form a recess at the rear end, so that when the first pressure plate (110) advances, contact between the step and the first protrusion (121a) may occur.

[0077] Additionally, a second protrusion (122a) may be formed on the second pressure plate (122) so as to be coupled with the second recess (112) of the first pressure plate (110) and partially protrude to one side (in the 12 o'clock direction according to FIG. 5). At this time, the second protrusion (122a) may be formed with one end protruding at a position corresponding to where the second recess (112) is formed to interlock with the second recess (112), and may be formed in a shape corresponding to the second recess (112).

[0078] For example, when the second recess (112) is formed by the other side of the front portion of the first pressure plate (110) being recessed inward, the second protrusion (122a) may be formed by one side of the front portion of the second pressure plate (122) being protruded outward, and accordingly, the second protrusion (122a) and the second recess (112) may be interlocked. At this time, the second recess (112) and the second protrusion (122a) may be formed in a stepped shape with a step difference, but are not limited thereto.

[0079] The second recess (112) of the first pressure plate (110) has a front end that is partially recessed to form a step at the rear end, and the second protrusion (122a) has a front end that is partially protruded to form a recess at the rear end, so that when the first pressure plate (110) advances, contact between the step and the second protrusion (122a) may occur.

[0080] As illustrated in FIG. 7, when the first pressure plate (110) advances, the step formed by the recess (111, 112) engages with the protrusion (121a, 122a) of the second pressure plate (120), so that the second pressure plate (120) advances together, thereby allowing pressure to be applied to one side of the pouch-type secondary battery (10). When the second pressure plate (120) advances, the engagement is released, and only the second pressure plate (120) advances, thereby allowing additional pressure to be applied to both edges of the pouch-type secondary battery (10).

[0081] Additionally, when the second pressure plate (120) moves backward, the protrusions (121a, 122a) of the second pressure plate (120) engage with the step formed by the recesses (111, 112) of the first pressure plate (110), and the first pressure plate (110) moves backward together, thereby releasing the pressure of the pouch-type secondary battery (10).

[0082] That is, by the interlocking connection between the recessed portion (111, 112) of the first pressure plate (110) and the protruding portion (121a, 122a) of the second pressure plate (120), the first pressure plate (110) maintains its connection with the second pressure plate (120) when moving forward, but the connection with the second pressure plate (120) can be released when moving backward.

[0083] Additionally, by the interlocking connection between the recessed portion (111, 112) of the first pressure plate (110) and the protruding portion (121a, 122a) of the second pressure plate (120), the second pressure plate (120) is released from connection with the first pressure plate (110) when moving forward, but the connection with the first pressure plate (110) is maintained when moving backward.

[0084] At this time, the first pressure plate (110) and the second pressure plate (120) can be driven forward and backward by the driving unit (300), and a more detailed description of the driving unit (300) will be provided later.

[0085] Meanwhile, the support plate (200) may be positioned at a predetermined distance forward from the pressure plate (100) located furthest forward (in the 3 o'clock direction according to FIG. 4) among the plurality of pressure plates (100).

[0086] At this time, the support plate (200) may be provided to support and press the front of the pouch-type secondary battery (10) located furthest forward when the pressure plate (100) presses the plurality of pouch-type secondary batteries (10).

[0087] The pressure plate (100) and the support plate (200) may be provided with a material having rigidity to apply pressure to the front and rear surfaces of the battery case (11). More specifically, the pressure plate (100) and the support plate (200) may be provided with metal, and may be provided with a metal including, for example, aluminum, but are not necessarily limited thereto.

[0088] The driving unit (300) can provide a pressing force to a plurality of pressing plates (100) to pressurize a pouch-type secondary battery (10) by driving the pressing plates (100) back and forth. At this time, the driving unit (300) can be connected to the pressing plate (100) located furthest back (9 o'clock direction in FIG. 4) among the plurality of pressing plates (100) to provide a back-and-forth driving force to the plurality of pressing plates (100).

[0089] The driving unit (300) may include a first driving unit (310) that drives the first pressure plate (110) back and forth, and a second driving unit (320) that drives the second pressure plate (120) back and forth.

[0090] The first driving unit (310) is connected to the rear of the first pressure plate (110) located at the rearmost position and can provide forward and backward driving force to the first pressure plate (110). At this time, the first driving unit (310) may be equipped with a motor having a driving force greater than a predetermined amount so that the second pressure plate (120), which is engaged with the first pressure plate (110), can also be moved forward together when driving forward, but is not limited thereto and may be equipped with a cylinder that provides forward and backward driving force.

[0091] The second driving unit (320) is connected to the rear of the second pressure plate (120) located at the rearmost position, and can provide forward and backward driving force to the second pressure plate (120). At this time, the second driving unit (320) can be connected to the rear of the seconda pressure plate (121) and the secondb pressure plate (122), respectively.

[0092] Additionally, the second driving unit (320) may be configured to provide an additional pressing force of a predetermined amount or more to the edge of the pouch-type secondary battery (10) after pressing the pouch-type secondary battery (10) through the first driving unit (310) and the first pressing plate (110). This second driving unit (320) may be configured as a cylinder, but is not limited thereto and may be configured as a motor having a driving force of a predetermined amount or more.

[0093] Accordingly, the first driving unit (310) provides a forward driving force to the first pressure plate (110), so that the first pressure plate (110) and the second pressure plate (120) press the pouch-type secondary battery (10), and additionally, the second driving unit (320) provides a forward driving force to the second pressure plate (120), so that the second pressure plate (120) provides additional pressure to the edge of the pouch-type secondary battery (10), so that uniform pressure can be applied to the entire surface area of ​​the pouch-type secondary battery (10).

[0094] A guide member (400) may be provided to guide the forward and backward movement of a plurality of pressure plates (100). The guide member (400) may be provided to penetrate the plurality of pressure plates (100) and have one end connected to a support plate (200).

[0095] A plurality of guide members (400) may be connected to one edge and / or the other edge of the second pressure plate (120) to guide them. For example, one or more guide members (400) may be connected to one edge of the seconda pressure plate (121) and one or more guide members may be connected to the other edge of the secondb pressure plate (122), and each end may be connected to the support plate (200).

[0096] Additionally, the guide member (400) may be connected by penetrating the lower end of the first pressure plate (110). For example, a support projection (113) may be formed at the lower end of the first pressure plate (110) and partially protrude forward so that a pouch-type secondary battery (10) can be seated thereon, and the guide member (400) may be connected to the first pressure plate (110) by penetrating the support projection (113). At this time, it is preferable that the support projection (113) protrudes less than the thickness of the pouch-type secondary battery (10) so that the pressure of the pouch-type secondary battery (10) is not obstructed.

[0097] For example, a plurality of guide members (400) can be connected at one end to a support plate (200) and at the other end to a pressure plate (100) located furthest rear among a plurality of pressure plates (100).

[0098] In addition, as another example, one end of a plurality of guide members (400) may be connected to a support plate (200), while the other end may be connected to a motor or gear (not shown) located at the rear of a plurality of pressure plates (100). At this time, male screw threads are formed on the outer surface of the plurality of guide members (400), and female screw threads are formed on the inner surface of the through hole of the pressure plate (100), so that the guide members (400) rotate according to the rotation of the motor or gear (not shown), thereby driving the pressure plate (100) forward and backward.

[0099] Although FIG. 6 shows the first pressure plate (110) being provided with a support ledge (113), it may be omitted.

[0100] Referring to FIGS. 2 to 7, a method for pressurizing a pouch-type secondary battery using a pouch-type secondary battery pressurizing device according to a first embodiment of the present invention comprises: (S1) a step of positioning a pouch-type secondary battery (10) between a pair of pressurizing plates (100) or between a pressurizing plate (100) and a support plate (200); (S2) a step of driving the pressurizing plate (100) forward through a driving unit (300); (S3) a step of pressurizing the pouch-type secondary battery (10) through the pressurizing plate (100); and (S4) a step of pressurizing both edge portions of the pouch-type secondary battery (10) through a second pressurizing plate (120).

[0101] In steps (S2) and (S3), the first pressure plate (110) and the second pressure plate (120) can be driven forward through the first driving unit (310) to pressurize the pouch-type secondary battery (10).

[0102] Additionally, in step (S4), the second pressure plate (120) can be driven forward through the second driving unit (320) to apply pressure to both edges of the pouch-type secondary battery (10).

[0103]

[0104] FIG. 8 is a plan view illustrating a modified pressure plate constituting a pouch-type secondary battery pressure device according to a first embodiment of the present invention.

[0105] Referring to FIG. 8, a recessed portion (111a, 112a) that is partially recessed toward the rear may be formed on the contact surface of the step formed by the first recess (111) and the second recess (112) of the first pressure plate (110), and a projection portion (121a', 122a') that engages with the recessed portion (111a, 112a) may be formed on each of the contact surfaces of the first protrusion (121a) of the second pressure plate (121) and the second protrusion (122a) of the second pressure plate (122).

[0106] For example, referring to FIG. 8(a), the recess (111a, 112a) is formed in an uneven shape that is recessed inward from the contact surface of the step formed by the first recess (111) and the second recess (112), and the protrusion (121a', 122a') can be formed in a shape corresponding to the recess (111a, 112a). That is, the protrusion (121a', 122a') can be formed in an uneven shape that protrudes outward from the first protrusion (121a) and the second protrusion (122a).

[0107] Also, as another example, referring to FIG. 8(b), the recess (111a, 112a) is formed in a semicircular shape that is recessed inward from the contact surface of the step formed by the first recess (111) and the second recess (112), and the protrusion (121a', 122a') can be formed in a shape corresponding to the recess (111a, 112a). That is, the protrusion (121a', 122a') can be formed in a semicircular shape that protrudes outward from the first protrusion (121a) and the second protrusion (122a).

[0108] The bonding force between the first pressure plate (110) and the second pressure plate (120) is increased by these indentations (111a, 112a) and protrusions (121a', 122a'), and the fluidity of moving to one side or the other side can be minimized.

[0109] The shapes of the indentations (111a, 112a) formed on the first pressure plate (110) and the protrusions (121a', 122a') formed on the second pressure plate (120) are not limited to these, and can be formed with various interlocking shapes that are obvious to those skilled in the art.

[0110] In addition, conversely, a protrusion (not shown) may be formed on the first pressure plate (110), and a recess (not shown) may be formed on the second pressure plate (120).

[0111]

[0112] FIG. 9 is a perspective view of a pouch-type secondary battery pressurizing device according to a second embodiment of the present invention, and FIG. 10 is a side view for explaining a pouch-type secondary battery pressurizing device according to a second embodiment of the present invention. FIG. 11 is a perspective view for explaining a pressurizing plate constituting a pouch-type secondary battery pressurizing device according to a second embodiment of the present invention, FIG. 12 is a perspective view for explaining a pouch-type secondary battery positioned on a pressurizing plate of a pouch-type secondary battery pressurizing device according to a second embodiment of the present invention, and FIG. 13 is a conceptual diagram for explaining a method of operating a pouch-type secondary battery pressurizing device according to a second embodiment of the present invention.

[0113] Referring to FIGS. 2, 9 to 13, the pouch-type secondary battery pressurizing device according to the second embodiment of the present invention is configured to include a pressurizing plate (100), a support plate (200), a driving unit (300), and a guide member (400), in the same manner as the first embodiment.

[0114] However, unlike the first embodiment, in the second embodiment, the first pressure plate (110) and the second pressure plate (120) constituting the pressure plate (100) may be positioned on one side and the other side in the full width direction (y-axis direction based on FIG. 11). At this time, the pouch-type secondary battery (10) that is pressed by the pressure plate (100) in the second embodiment may be a unidirectional pouch-type secondary battery (10) in which the electrode lead (12) is positioned in one direction.

[0115] The total length of the pouch-type secondary battery (10) refers to the x-axis direction where the pair of electrode leads (12) are not protruding, and the total width refers to the y-axis direction where the pair of electrode leads (12) are protruding.

[0116] The first pressure plate (110) is provided to apply pressure to the central portion based on the full width direction of the pouch-type secondary battery (10), and the second pressure plate (120) may be provided to apply pressure to the edge based on the full width direction of the pouch-type secondary battery (10).

[0117] The first pressure plate (110) may be provided with a total width (in the y-axis direction based on FIG. 12) that is less than the total width of the pouch-type secondary battery (10), and a total length (in the x-axis direction based on FIG. 12) that is equal to or greater than the total length of the pouch-type secondary battery (10).

[0118] Additionally, the second pressure plate (120) is provided such that its total width (in the y-axis direction according to FIG. 12) is equal to or exceeds the total width direction edge of the pouch-type secondary battery (10) from one end or the other end of the first pressure plate (110), and its total length (in the x-axis direction according to FIG. 12) is provided such that it corresponds to the total length of the first pressure plate (10).

[0119] Additionally, the guide member (400) can be connected by penetrating both edges of the first pressure plate (110) and the second pressure plate (120) in the full-length direction.

[0120] Since the pouch-type secondary battery pressurization method according to the second embodiment is substantially the same as the pouch-type secondary battery pressurization method according to the first embodiment, a more detailed description is omitted.

[0121]

[0122] As specific parts of the present invention have been described in detail above, it is obvious to those skilled in the art that such specific descriptions are merely preferred embodiments and do not limit the scope of the invention, and that various changes and modifications are possible within the scope and spirit of the invention, and that such variations and modifications fall within the scope of the appended claims.

[0123] (Explanation of symbols)

[0124] 10: Pouch-type secondary battery

[0125] 11: Battery case 12: Electrode lead

[0126] 100: Pressure plate

[0127] 110: First pressure plate

[0128] 111: First depression 111a: Indentation

[0129] 112: Second depression 112a: Indentation

[0130] 113: Support jaw

[0131] 120: Second pressure plate

[0132] 121: 2a Pressure Plate

[0133] 121a: First protrusion 121a': Projection

[0134] 122: 2b Pressure Plate

[0135] 122a: Second protrusion 122a': Projection

[0136] 200: Support plate

[0137] 300: Drive unit

[0138] 310: 1st drive unit

[0139] 320: Second drive unit

[0140] 400: Guide missing

Claims

1. A pressure plate provided to apply pressure to a pouch-type secondary battery; A support plate located in front of the above-mentioned pressure plate; and A driving unit for driving the above-mentioned pressure plate back and forth; comprising, A pouch-type secondary battery pressurizing device characterized by comprising a first pressurizing plate that presses the central portion of the pouch-type secondary battery, and second pressurizing plates disposed on both sides of the first pressurizing plate that press the edges of the pouch-type secondary battery.

2. In Paragraph 1, The above driving unit is, A first driving unit for driving the first pressure plate; and A pouch-type secondary battery pressurizing device characterized by including a second driving unit for driving the second pressurizing plate.

3. In Paragraph 2, A pouch-type secondary battery pressurizing device characterized in that the second pressurizing plate comprises a second pressurizing plate a seconda located on one side of the first pressurizing plate and a secondb located on the other side of the first pressurizing plate.

4. In Paragraph 3, The first pressure plate has a first recessed portion with one side partially recessed and a second recessed portion with the other side partially recessed formed therein, and The above 2a pressure plate has a first protrusion formed thereon that partially protrudes to be coupled with the first recess, and A pouch-type secondary battery pressurizing device characterized in that the above-mentioned secondb-pressurizing plate has a second protrusion formed thereon that partially protrudes to be coupled with the above-mentioned second recess.

5. In Paragraph 4, The above-mentioned first pressure plate is, When driving forward, the connection with the second pressure plate is maintained, A pouch-type secondary battery pressurizing device characterized by the coupling with the second pressurizing plate being released during reverse driving.

6. In Paragraph 4, The above second pressure plate is, When driving forward, the connection with the first pressure plate is released, A pouch-type secondary battery pressurizing device characterized by maintaining the connection with the first pressurizing plate during reverse driving.

7. In Paragraph 2, A pouch-type secondary battery pressurizing device characterized in that the first driving unit is equipped with a motor.

8. In Paragraph 2, A pouch-type secondary battery pressurizing device characterized in that the second driving unit is provided as a cylinder.

9. In Paragraph 2, A pouch-type secondary battery pressurizing device characterized by having a plurality of pressure plates and being arranged side by side at a predetermined distance apart in the forward and backward directions.

10. In Paragraph 9, A pouch-type secondary battery pressurizing device characterized in that the support plate is positioned in front of the plurality of pressurizing plates, spaced apart by a predetermined distance from the pressurizing plate located at the foremost of the plurality of pressurizing plates.

11. In Paragraph 10, A pouch-type secondary battery pressurizing device characterized in that the support plate is provided to support and pressurize the front surface of the pouch-type secondary battery located at the foremost when the pressurizing plate pressurizes a plurality of pouch-type secondary batteries.

12. In Paragraph 10, A pouch-type secondary battery pressurizing device characterized by further including a guide member that penetrates the plurality of pressurizing plates to guide the forward and backward movement of the plurality of pressurizing plates, with one end connected to the support plate.

13. A pressurizing method using a pouch-type secondary battery pressurizing device according to any one of claims 1 to 12, (S1) A step of positioning the pouch-type secondary battery between a pair of pressure plates, or between a pressure plate and a support plate; (S2) A step of driving the pressure plate forward through the driving unit; (S3) A step of applying pressure to the pouch-type secondary battery through the above-mentioned pressure plate; and (S4) A step of applying pressure to both edges of the pouch-type secondary battery (10) through the second pressure plate; characterized by a method for applying pressure to a pouch-type secondary battery.

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